Recuperative furnace.



No. 659,602. Patanted 0st. 9, m00. F. BREDEL. M.,

HECUPEHATWE FURHACE.

(Applicnion lied. my 24. 1900..

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r. emaux-1. |900 RECUFERATIVE FURIIACE.

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. whereby the separating-blocks are prevented from becoming loose, which would cause the UNITED STATES PATENT OEEICE.

RECU PERATIVE FURNAC E.

SPECIFICATION forming part of Letters Patent No. 659,602, dated October 91 l 900. Application filed March 24,1900. Serial No. 10.116. (Nn muur-,1.1

b fdl 1071/0771/ t ifm/y con-cern:

Be it known that I, FREDERICK BREDEL, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of lVisconsin, have invented certain new and useful Improvements in Recnperative Furnaces; and I do declare the following to be a full, clear, and exact-description ol the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon7 which form a part of this specification.

This invention relates to improvements in apparatus for @ating retorts, muiliegfd,

an d especially tofi. lrc"`n` ii'li'ch'a pri mary supply of air is delivered to the fire-box and a secondary supply of air mingled with the gases which form a part of the products of combustion.

The invention consists, further, in a peculiarly-constructed recuperator and its connection with the other parts of the furnace, in which are arranged peculiarly-constructed interlocking blocks between the recuperators,

recuperator to leak and destroy the efficiency of the latter.

In carrying' out the present invention I improve upon the apparatus for heating retorts as shown in the Klonne patent, No. 378,097, which is a type of furnace well .known in the art.

My invention will be readily understood from the following detailed description when considered in connection with the drawings forming a part of the present application.

The invention is clearly illustrated in the accompanying drawings, which have similar letters of reference indicating like parts throughout the several views, in which Figure l is a longitudinal sectional view through one of the recuperator-tiles. 2 is a vertical lsectional detail View through the recuperator-block. Fig. 3 is a perspective View of one of the blocks on which the recu perator-tiles rest. Fig. 4- is a perspective view showing the shape of one of the recuperatorn tiles. Fig. 5 is a detail view of one of the rccuperator locking and separator blocks.' Fig. G is a vertical longitudinal section through a recuperatonfurnace, showing thc arrangement of the blocks. Fig. '7 is a scotional view taken on line ll 1l of Fig. (i, and Fig. 8 is a sectional viewon line 1212 of Fig. f5. Reference now heilig had to the details of the drawings by letter, on either side of the fire-box (not shown in the drawings) are arranged the two sections ot' the recupera-tors, each section of which is composed of superimposed tiles E, (a detail View of one of said blocks being shown in Fig. of thedrawings.) These blocks of tile have vertical passageways E', preferably arrangedin uincunx or; Lr to obtain the maximum heating'eet' Vand the heated products oit-combustion are adapted to pass down through said vertical passage-ways in their exit from the furnace. Said tile blocks have also horizontal passage` ways F between said vertical passage-ways, through which horizontal ways the primary and secondary supplies of air iiowand become somewhat heated by the adjacent outowing products of combustion passing through the vertical passage-ways. Between each of said recuperator-blocks are disposed the tracted, as vtmGi-,o fit into the recesses ori grooves hin the retaininglbllgsllis The opposite faces o'f the contracted portions of the blocks H have similarly-disposed grooves, as shown in the drawings. The lower faces of said contracted portions of blocks H are adapted to rest upon the upper faces of the recu- 4perator tile blocks, and the headed or flanged portions of the blocks are adapted to project beyond the outside faces or sides of the superimposed tile blocks. On each longitudinal upper face, near its outer edge, of the' tile recuperator-blocks strips and locking-blocks are placed and support tier after tier of' the recu perator-blocks, thus forming two circui- Jtous passage-ways in two directions, one being for conducting the infowing currents of air and the other for the products of combustion. By the arrangement of the interlocking blocks above described the recuperatorblocks are prevented from becomingloosened and are kept intact. This loosening of the blocks in recuperators now in use is caused IOC by small explosions in firing up the benches 0r when in clean ing the recuperator the blocks have been found to be easily displaced.

Leading into the furnace, through the front wall of same, is a duct which leads to and communicates with the Space about the lower set of reeuperator-blocks. From the space about the lower s et of recuperators a duct leads through into the fire-box (not shown) beneath the grate. Through this passageway leading from the entrance to the space about the lower set of recuperator-bloeks and thence to and through said duct the supply is designed to pass into the combustionchamber.

By reason of the outer faces of the blocks I-I bearing against the walls S it will be observed that the Various reeuperator-blocks and retaining-strips will be securely held intact.

Having thus described my invention, what I claim to be new, and desire -to secure by Letters Patent, is-

l. In a reenperative furnace, a recuperator made up of superimposed recnperator-blocks, having vertical and transverse passage-ways through same, key-blocks engaging said recuperator-blocks and side supporting-strips interlocking with said key-blocks, and .interposed with the latter between the rows of recuperator-bloeks.

2. In a reenperative furnace, a recuperator made n p of superimposed recuperator-hloeks having horizontal and vertical passage-ways through saine, key blocks having fianged heads engaging the outer edges of the recuperator-blocks, the outer ends of said keyblocks hearing against the wall of the recuperator-ehamber, the supporting-strips interlocking with the key-blocks and interposed with the latter between the tiers of recuperator-bloeks, and suitable passage-ways leading to and from the recnperator, as set forth.

3. In a recuperative furnace, the combination with the reeuperative blocks arranged in tiers, and having the usual vertical and horizontal passage-ways through saine, the keyblocks having Vertical grooves in their opposite faces, and having flanged heads, the supporting-strips having contracted ends seated in said grooves, and interposed with said keyblocks between the tiers. of recuperatorblocks, the outer ends of the key-blocks held against the wall of the recuperator-chamber, as set forth.

In testimony whereof I aflx my signature in presence of two Witnesses.

FREDERICK BREDEL..

Witnesses:

ERNEST KETTLER, FRANKLIN H. HOUGH. 

